That is exactly what I was going to end up doing if I could not resolve my self launch issue, but I was able to add some weights to the anchor and use the original pulpit roller design and make it work. Has not been an issue since. I have some other posts on here you might have already seen about it.
I was worried to widen up the slot and thought it would be better to fill the tapered slot and mount the roller assy. on the top, flush like many of the other pulpits out there, but one issue there would be if the anchor would then come up and hit the bottom of the pulpit.
Keep us posted on how well it works out and if you get in some binds that will put some stress on the pulpit let us know how it does.
At this point, I am satisfied, but the only thing left now to resolve would be the anchor ability to right itself. The original narrow design does not allow it to rotate and come upright. I would assume the one you have here will allow it to rotate if it comes in upside down?